$(a)\;50\qquad(b)\;5\qquad(c)\;15\qquad(d)\;0.050$

Answer : 50

Explanation :

Cogulation value is the millimoles of an electrolyte that must be added to 1 L of a colloidal solution for complete coagulation .

Therefore , 5 mL of 1 M Nacl = $\large\frac{1}{1000}\times 5 = 0.005 $ or 5 m moles .

100 mL of a colloidal solution require Nacl for complete coagulation = 50 m moles

Therefore , Coagulation value of Nacl = 50

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